His grandfather _____________ for over two years.
It’s said that ______ of the water around the world ______ polluted.
This is the school _______ we visited last year.
Many students in our school _______ the old and they usually offer their seats to them on buses.
I don’t think the newly-directed film by Zhaowei is as interesting as people say, _______?
I can’t play the piano, and _______.